How to return a specific Page instance with an activation context?

[Pete Poulos]

Hi,

I'm trying to implement a standard mechanism for providing feedback to
users after they perform operations such as your standard CRUD
operations.  The idea is that they click a link such as "delete" and
it performs the operation returns to that page, but with a message
along the top that says "<something> has been deleted".  The vast
majority of the users state is stored in the page's activation
context, but I don't want to store the feedback message there as it
ends up complicating the context processing across all of the
applications pages.

Storing the message using @Persist(PersistenceConstants.FLASH) seems
like the way to go.  However, because many of my operations are used
across multiple pages I decided to implement these operations as
separate pages that perform the operation and return to the caller.
Here is an example:

public class DeleteItem {

   @Inject
   private ItemDao itemDao;

   @Inject
   private PageRenderLinkSource pageLinkSource;

   @Inject
   private ComponentSource componentSource;

   @CommitAfter
   public Object onActivate( long id, String page ) {
      return deleteItem( id, page, null );
   }

   @CommitAfter
   public Object onActivate( long id, String page, String context ) {
      return deleteItem( id, page, context );
   }

   private Object deleteItem( long id, String page, String context ) {
      itemDao.delete( id );

//      Component comp = componentSource.getPage( page );
//      if( comp instanceof FlashMessagePage ) {
//         ((FlashMessagePage)comp).setFlashMessage( "Bah Humbug!" );
//      }
//      return ???;

      return context != null
         ? pageLinkSource.createPageRenderLinkWithContext( page, context )
         : pageLinkSource.createPageRenderLink( page )
         ;
   }
}

The crux of my problem is in the commented code.  I need to return a
specific page (comp) which has had flash persisted page properties set
on it, but I also need to set the context for that page.  However, all
mechanisms for creating a link with a passivation/activation context
(that I can see) only accept a page name (String) or the class object
of the page (Class).  How do I return a specific page instance with an
activation context?

In the above code, it would be nice if I could do the following:

   private Object deleteItem( long id, String page, String context ) {
      itemDao.delete( id );

      Component comp = componentSource.getPage( page );
      if( comp instanceof FlashMessagePage ) {
         ((FlashMessagePage)comp).setFlashMessage( "Bah Humbug!" );
      }

      return context != null
         ? pageLinkSource.createPageRenderLinkWithContext( comp, context )
         : pageLinkSource.createPageRenderLink( comp )
         ;
   }

Thanks,
Pete Poulos

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